با سلام خدمت کاربران در صورتی که با خطای سیستم پرداخت بانکی مواجه شدید از طریق کارت به کارت (6037997535328901 بانک ملی ناصر خنجری ) مقاله خود را دریافت کنید (تا مشکل رفع گردد).
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1 |
Quantum Control of Optically Active Artificial Atoms With Surface Acoustic Waves
کنترل کوانتومی اتم های مصنوعی فعال نوری با امواج صوتی سطحی-2022 Surface acoustic waves (SAWs) are a versatile tool for realizing coherent quantum interfaces
between various solid-state qubits spanning microwave to optical frequencies. Through strain, electric, or
magnetic fields associated with acoustic waves, qubit states can be controlled and measured with exquisite
precision for applications in quantum information processing, memory, transduction, and sensing. In this
review, we discuss progress toward quantum control using surface acoustic waves coupled to optically active
artificial atoms, including semiconductor quantum dots (QDs), optically addressable solid-state spins, and
quantum emitters in van der Waals materials. We outline the device, material, and theoretical considerations
for realizing interactions with surface acoustic waves in the quantum regime, summarize the state of the art in
coupling surface acoustic waves to artificial atoms, and provide insight into the current trends and trajectory
of the field.
INDEX TERMS: Quantum dots (QDs) | quantum networking and communications | surface acoustic waves (SAWs). |
مقاله انگلیسی |
2 |
Tunneling Current Through a Double Quantum Dots System
جریان تونل زنی از طریق سیستم دو نقطه کوانتومی-2022 Electrostatically confined quantum dots in semiconductors hold the promise to achieve high
scalability and reliability levels for practical implementation of solid-state qubits where the electrochemical
potentials of each quantum dot can be independently controlled by the gate voltages.In this paper, the
current and charge stability diagram of two-well potentials arising from electrostatically defined double
quantum dot (DQD) are analytically realized. We propose to apply the Generalized Hubbard model to find
the Hamiltonian of the system. The proposed analysis takes the tunnel coupling between the dots, Coulomb
interaction, and Zeeman energy arising from an external magnetic field into account. Using quantum master
equations to predict the probability of the final states in a DQD system, we study the tunneling current
through two quantum dots coupled in series with two conducting leads, and therefore, the charge stability
diagram is theoretically investigated. The impact of the tunnel coupling and Zeeman energy on the charge
stability diagram is deeply discussed. The validity of the presented analysis is confirmed by experimental
data as well as the classical capacitance model.
INDEX TERMS: Double quantum dot | hubbard model | zeeman energy | charge stability diagram | master equation. |
مقاله انگلیسی |
3 |
Influence of wire electrical discharge machine cutting parameters on the magnetization characteristics of electrical steel laminations
تاثیر پارامترهای برش دستگاه تخلیه الکتریکی سیم بر ویژگی های مغناطش ورقه های فولادی الکتریکی-2021 This paper presents the influence of wire electrical discharge machine (WEDM) cutting parameters on the
magnetization characteristics of electrical steel. The demand for electrical steel keeps increases because
of the high demand of electrical motor and transformers for electric vehicle and smart grid applications.
The magnetization characteristics of the laminated steel used in these machines have dominates the performance of these machines. The cuttings methods and cutting parameters have huge role in deciding the
magnetization characteristics. In this work, WEDM is used to cut the electrical steel in to small pieces.
The cutting parameters such as current, feed rate and on-time of WEDM are varied by keeping two of
these parameters fixed and one varied. From the electrical steel sheet, 18 sample small electrical steel
pieces are obtained at various cutting parameters of WEDM. The magnetic field – magnetization characteristics are obtained using vibrating sample magnetometer (VSM). This analysis shows that higher current, lower on-time and higher feed rate is providing higher magnetization.
Keywords: Wire electrical discharge machine | Vibrating sample magnetometer | Electrical steel | Cutting parameter | Magnetization |
مقاله انگلیسی |
4 |
Thermodynamic second law analysis of magnetomicropolar fluid flow past nonlinear porous media with non-uniform heat source
تحلیل قانون دوم ترمودینامیکی جریان سیال مگنتومیکروپولار از رسانه متخلخل غیرخطی با عبور منبع حرارتی غیر یکنواخت -2020 This study analyzes the second law of thermodynamic for entropy generation in an
irreversible hydromagneto-micropolar flow system with non-homogenous heat generation. The
non-symmetric microstructure fluid flow past a stretching sheet with saturated porous nonlinear
media under magnetic field influence. Ignoring the fluid particle deformation, the microstructure
is assumed rigid with the viscous suspended medium. The reduced dimensionless
nonlinear formulated model is computationally coded and solved to obtain solutions for the entropy
volumetric production, Bejan number and heat transfer magneto-micropolar fluid. The
parameter dependent solutions for the flow characteristics and irreversibility processes are
plotted and discussed. It is revealed from the study that minimization of entropy generation
in a magneto-micropolar flow system is possible by improving the thermodynamic equilibrium
with low material variables, viscosity and hysteresis magnetic. Also, it is seen that the terms
that encourage internal heat generation reduces the micropolar fluid viscosity in the system. KEYWORDS : Micropolar | Non-Newtonian fluid | Entropy generation | Stretching sheet | Thermodynamic law |
مقاله انگلیسی |
5 |
Convergence from two-fluid incompressible Navier-Stokes-Maxwell system with Ohm’s law to solenoidal Ohm’s law: Classical solutions
همگرایی تراکم ناپذیر سیستم ناویر-استوکس-ماکسول دو سیال با قانون اهم به قانون سیملوله اهم: راه حل های کلاسیک-2020 The asymptotics from the two-fluid incompressible Navier-Stokes-Maxwell system with Ohm’s law to solenoidal Ohm’s law was pointed out in Arsénio-Saint-Raymond’s work [3]. We justify rigorously this limit in the context of global-in-time classical solutions. The key is to derive the global-in-time uniform in εenergy estimate of the rescaled system with Ohm’s law by employing the decay properties of both the electric field Eεand the wave equation with linear damping of the divergence free magnetic field Bε, then take the limit as ε→0to obtain the solutions of the system with solenoidal Ohm’s law. Keywords:Navier-Stokes-Maxwell system | (Solenoidal) Ohm’s law | Uniform estimate | Singular limits |
مقاله انگلیسی |
6 |
Light trapping induced flexible wrinkled nanocone SERS substrate for highly sensitive explosive detection
بستر SERS nanocone چین خورده انعطاف پذیر ناشی از به دام انداختن نور برای تشخیص مواد منفجره بسیار حساس-2020 We reported an ultrasensitive TNT detection method via a novel light trapping induced wrinkled nanocone
flexible SERS substrate, which was fabricated by colloidal lithography and oxygen plasma etching on transparent
PET film. Especially, a set of nanowrinkles with 50−60 nm was found on the sidewall of nanocone after etching.
By coating 30 nm gold film, this flexible SERS substrate provided uniform hot spots, which demonstrated high
reproducibility and sensitivity. 4-ATP molecules based Meisenheimer complex, which is a well-known chargetransfer
interaction between electron-poor TNT and electron-rich amino group, was taken to detect ultra-low
concentration of TNT explosive. The Raman signal of TNT was significantly enhanced by charge-transfer, light
trapping effect and coupled electromagnetic field. The detection sensitivity of TNT molecules was as low as
10−13mol/L, and show a good linear response in the range from 10−8 to 10−13mol/L. Consequently, by
brushing this flexible SERS substrate onto a cloth bag, trace amount of TNT residues with concentration as low as
10-10mol/L can be easily analyzed. It is believed that the proposed highly sensitive and uniform flexible substrate
provides a significant solution for trace analysis of TNT residue in criminal forensic, military and security check. Keywords: Nanocone | Nanowrinkle | Flexible materials | Light trapping | SERS |
مقاله انگلیسی |
7 |
Dielectric surface coated with thin partially-reflecting mirror : A revisit to Fresnel laws
سطح دی الکتریک پوشیده از آینه نازک تا حدودی منعکس کننده: بازنگری در قوانین Fresnel -2020 New forms of Fresnel reflection and transmission coefficients were derived in the case of oblique
optical incidence at the interface of dielectric medium coated with thin partially-reflecting
mirror. This essentially required the application of modified boundary conditions for both the
electric and magnetic fields. The expressions for power reflectivity (of the mirror) were obtained
for both the transverse electric (TE) and transverse magnetic (TM) waves considering the cases of
dielectric and metallic coatings. The reflectance and transmittance of the coated surface were
also examined corresponding to different values of mirror reflectivity. It is expected that the
forms of Fresnel coefficients would be useful in modeling optical and optoelectronic mirror-based
devices. Keywords: Optical interaction | Fresnel coefficients | Reflective coating | Geometrical optics |
مقاله انگلیسی |
8 |
AI Aided Noise Processing of Spintronic Based IoT Sensor for Magnetocardiography Application
پردازش نویز به کمک هوش مصنوعی مبتنی بر حسگر اینترنت اشیا بر Spintronic برای کاربرد مغناطیسی قلب-2020 As we are about to embark upon the highly hyped
“Society 5.0”, powered by the Internet of Things (IoT), traditional
ways to monitor human heart signals for tracking cardio-vascular
conditions are challenging, particularly in remote healthcare
settings. On the merits of low power consumption, portability,
and non-intrusiveness, there are no suitable IoT solutions that
can provide information comparable to the conventional Electrocardiography
(ECG). In this paper, we propose an IoT device
utilizing a spintronic-technology-based ultra-sensitive Magnetic
Tunnel Junction (MTJ) sensor that measures the magnetic fields
produced by cardio-vascular electromagnetic activity, i.e. Magentocardiography
(MCG). We treat the low-frequency noise
generated by the sensor, which is also a challenge for most
other sensors dealing with low-frequency bio-magnetic signals.
Instead of relying on generic signal processing techniques such
as moving average, we employ deep-learning training on biomagnetic
signals. Using an existing dataset of ECG records, MCG
signals are synthesized. A unique deep learning model, composed
of a one-dimensional convolution layer, Gated Recurrent Unit
(GRU) layer, and a fully-connected neural layer, is trained using
the labeled data moving through a striding window, which is able
to smartly capture and eliminate the noise features. Simulation
results are reported to evaluate the effectiveness of the proposed
method that demonstrates encouraging performance. Index Terms: Smart health | IoT | ECG | MCG | deep learning | noise | spintronic sensor | convolution | GRU | medical analytics |
مقاله انگلیسی |
9 |
What electrophysiology tells us about Alzheimer’s disease: a window into the synchronization and connectivity of brain neurons
آنچه الکتروفیزیولوژی در مورد بیماری آلزایمر به ما می گوید: پنجره ای برای هماهنگ سازی و اتصال نورون های مغز-2020 Electrophysiology provides a real-time readout of neural functions and network capability in different
brain states, on temporal (fractions of milliseconds) and spatial (micro, meso, and macro) scales unmet
by other methodologies. However, current international guidelines do not endorse the use of electroencephalographic
(EEG)/magnetoencephalographic (MEG) biomarkers in clinical trials performed in
patients with Alzheimer’s disease (AD), despite a surge in recent validated evidence. This position paper
of the ISTAART Electrophysiology Professional Interest Area endorses consolidated and translational
electrophysiological techniques applied to both experimental animal models of AD and patients, to probe
the effects of AD neuropathology (i.e., brain amyloidosis, tauopathy, and neurodegeneration) on
neurophysiological mechanisms underpinning neural excitation/inhibition and neurotransmission as
well as brain network dynamics, synchronization, and functional connectivity, reflecting thalamocortical
and corticocortical residual capacity. Converging evidence shows relationships between abnormalities in
EEG/MEG markers and cognitive deficits in groups of AD patients at different disease stages. The supporting
evidence for the application of electrophysiology in AD clinical research as well as drug discovery
pathways warrants an international initiative to include the use of EEG/MEG biomarkers in the main
multicentric projects planned in AD patients, to produce conclusive findings challenging the present
regulatory requirements and guidelines for AD studies. Keywords: The Alzheimer’s Association International | Society to Advance Alzheimer’s Research | and Treatment (ISTAART) | Alzheimer’s disease (AD) | Electroencephalography and | magnetoencephalography (EEG and MEG) | Resting-state condition | Event-related potentials and magnetic fields | Preclinical and clinical research |
مقاله انگلیسی |
10 |
Energy- and exergy-based optimal designs of a low-temperature industrial waste heat recovery system in district heating
طرح های بهینه مبتنی بر انرژی و اگزرژی سیستم کمکی برای بازیابی زباله های صنعتی با دمای پایین در گرمایش منطقه-2020 This paper illustrates how the choice of indicators changes the design of a waste heat recovery system in district
heating. A prospective system in Grenoble (France) aims to valorize waste heat from the French National
Laboratory of Intense Magnetic Fields (LNCMI) by injecting it at 85 °C to the nearby district heating network. We
optimize its design for three possible waste heat temperatures: 35 °C (current), 50 °C (viable) and 85 °C (innovative).
As major components, the system includes a thermal storage (ranging from 10 MWh to 40 MWh) and
may include a heat pump depending on the waste heat’s temperature. Different optimizations are guided by two
energetic indicators (one source-oriented, the other demand-oriented) and by the overall exergy efficiency. The
system’s annual performance is assessed through the Sankey and Grassman diagrams and compared between
optimal designs. Yearly simulation included optimal management of the thermal storage, through mixed-integer
linear programming. The demand-oriented optimal design suggests recovering waste heat at 35 °C with a heat
pump and a 40-MWh storage, granting the highest coverage of residential needs (49%). On the other hand, the
source-oriented optimal design suggests recovering waste heat at 85 °C without heat pump and with a 40-MWh
storage, reaching the highest recovery of waste heat (55%). Exergy analysis supports the source-oriented design,
as it reaches the highest global exergy efficiency (27%). Our prospective techno-economic and exergo-economic
analyses should complement these results and may change some conclusions, especially regarding the storage
capacity. Keywords: Waste heat recovery | District heating network | Design optimization | Energy management | Exergy optimization |
مقاله انگلیسی |